<?php

// $Id: calc_ttf_image.php 1371 2011-01-09 15:12:09Z Luisehahne $

/*

 Website Baker Project <http://www.websitebaker.org/>
 Copyright (C) 2004-2009, Ryan Djurovich

 Website Baker is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 Website Baker is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with Website Baker; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

require_once("../../../config.php");
require_once(WB_PATH.'/include/captcha/captcha.php');

if(!isset($_SESSION['captcha_time']))
	exit('missing captcha_time');
//unset($_SESSION['captcha_time']);		// otherwise there can't be 2 captchas on one page!

// get lists of fonts and backgrounds
require_once(WB_PATH.'/framework/functions.php');
$t_fonts = file_list(WB_PATH.'/include/captcha/fonts');
$t_bgs = file_list(WB_PATH.'/include/captcha/backgrounds');
$fonts = array();
$bgs = array();
foreach($t_fonts as $file) { if(preg_match('/\.ttf/',$file)) { $fonts[]=$file; } }
foreach($t_bgs as $file) { if(preg_match('/\.png/',$file)) { $bgs[]=$file; } }

// Captcha
$sec_id = '';
if(isset($_GET['s'])) $sec_id = $_GET['s'];
$_SESSION['captcha'.$sec_id] = '';
mt_srand((double)microtime()*1000000);
$n = mt_rand(1,3);
switch ($n) {
	case 1:
		$x = mt_rand(1,9);
		$y = mt_rand(1,9);
		$_SESSION['captcha'.$sec_id] = $x + $y;
		$cap = "$x+$y";
		break;
	case 2:
		$x = mt_rand(10,20);
		$y = mt_rand(1,9);
		$_SESSION['captcha'.$sec_id] = $x - $y;
		$cap = "$x-$y";
		break;
	case 3:
		$x = mt_rand(2,10);
		$y = mt_rand(2,5);
		$_SESSION['captcha'.$sec_id] = $x * $y;
		$cap = "$x*$y";
		break;
}
$text = $cap;

// choose a font and background
$font = $fonts[array_rand($fonts)];
$bg = $bgs[array_rand($bgs)];
// get image-dimensions
list($width, $height, $type, $attr) = getimagesize($bg);

// create reload-image
$reload = ImageCreateFromPNG(WB_PATH.'/include/captcha/reload_140_40.png'); // reload-overlay

if(mt_rand(0,2)==0) { // 1 out of 3

	// draw each character individualy
	$image = ImageCreateFromPNG($bg); // background image
	$grey = mt_rand(0,50);
	$color = ImageColorAllocate($image, $grey, $grey, $grey); // font-color
	$ttf = $font;
	$ttfsize = 25; // fontsize
	$count = 0;
	$image_failed = true;
	$angle = mt_rand(-10,10);
	$x = mt_rand(20,35);
	$y = mt_rand($height-10,$height-2);
	do {
		for($i=0;$i<strlen($text);$i++) {
			$res = imagettftext($image, $ttfsize, $angle, $x, $y, $color, $ttf, $text{$i});
			$angle = mt_rand(-10,10);
			$x = mt_rand($res[4],$res[4]+10);
			$y = mt_rand($height-12,$height-7);
		}
		if($res[4] > $width) {
			$image_failed = true;
		} else {
			$image_failed = false;
		}
		if(++$count > 4) // too many tries! Use the image
			break;
	} while($image_failed);

} else {

	// draw whole string at once
	$image_failed = true;
	$count=0;
	do {
		$image = ImageCreateFromPNG($bg); // background image
		$grey = mt_rand(0,50);
		$color = ImageColorAllocate($image, $grey, $grey, $grey); // font-color
		$ttf = $font;
		$ttfsize = 25; // fontsize
		$angle = mt_rand(0,5);
		$x = mt_rand(20,35);
		$y = mt_rand($height-10,$height-2);
		$res = imagettftext($image, $ttfsize, $angle, $x, $y, $color, $ttf, $text);
		// check if text fits into the image
		if(($res[0]>0 && $res[0]<$width) && ($res[1]>0 && $res[1]<$height) &&
			 ($res[2]>0 && $res[2]<$width) && ($res[3]>0 && $res[3]<$height) &&
			 ($res[4]>0 && $res[4]<$width) && ($res[5]>0 && $res[5]<$height) &&
			 ($res[6]>0 && $res[6]<$width) && ($res[7]>0 && $res[7]<$height)
		) {
			$image_failed = false;
		}
		if(++$count > 4) // too many tries! Use the image
			break;
	} while($image_failed);

}

imagealphablending($reload, TRUE);
imagesavealpha($reload, TRUE);

// overlay
imagecopy($reload, $image, 0,0,0,0, 140,40);
imagedestroy($image);
$image = $reload;

captcha_header();
ob_start();
imagepng($image);
header("Content-Length: ".ob_get_length());
ob_end_flush();
imagedestroy($image);
